<!DOCTYPE html>
<!--
Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
Click nbfs://nbhost/SystemFileSystem/Templates/Scripting/EmptyPHPWebPage.php to edit this template
-->
<?php
        // put your code here
session_start();
if(count($_POST)){
    if($_POST["username"]=="abc"&&$_POST["upwd"]=="123"){
        $_SESSION["login_id"]=110;
    } else{
        echo "用户名或者密码错误！";
    }
}     
?>
<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
    </head>
    <body>
        <?php
        if(isset($_SESSION["login_id"])){
        ?>    
          你已经登录<br/>
          <a href="logout.php">登出</a>
        <?php
        }else{
        ?>
          <h1>用户登录<h1>
           <form action="login.php" method="POST">
            用户名:<input type="text" name="username"/><br/>
            密 码:<input type="password" name="upwd"/><br/>
            <input type="submit" name="登录">
        </form>
        <?php
        }
        ?>
    </body>
</html>
